//Cut, Copy and Paste are the common commands used any application,<TextBoxCommandManager.PreviewExecuted="textBox_PreviewExecuted"/>//in above textbox code we can restrict these commands in PrviewExecuted event of CommandManager Class//and in code behind add below code and your job is doneprivatevoidtextBox_PreviewExecuted(objectsender,ExecutedRoutedEventArgse){if(e.Command==ApplicationCommands.Copy||e.Command==ApplicationCommands.Cut||e.Command==ApplicationCommands.Paste){e.Handled=true;}}